Cold email infrastructure starting at $1/mailbox. Volume discounts down to $0.55.Calculate your cost
ColdRelay
As low as $0.55/mailbox

Advanced Azure cold email infrastructure. 150 mailboxes per domain — not 2. Auto DNS. Auto warmup. 99% inbox guaranteed. Ready in hours, not weeks.

From $0.55/mailbox → See Pricing
JB

We went from 400 to 4,200 sends/day in a single weekend. DNS was auto, warmup was instant. Our SDRs booked more meetings in the first week on ColdRelay than the prior month.

JB
Jake BrennanCEO · ScaleOutbound
+10× VOLUME3.3% REPLY
KM

I stopped being an IT admin. I used to spend Tuesdays reconfiguring DKIM — now I spend them talking to prospects. That's the whole pitch.

KM
Kaitlyn MeyersHead of GTM · Parallel
−14h/WEEK0 TICKETS
RS

The deliverability is the real story. We ran identical campaigns on Google and ColdRelay — 38% inbox on Google, 96% on ColdRelay. Same copy, same lists.

RS
Rahul ShahFounder · Coldwave Agency
96% INBOX240 MAILBOXES
AL

We ditched three vendors for one dashboard. Pricing tiers are actually transparent — we know what 1,000 mailboxes costs before we click anything.

AL
Ava LindqvistOps Lead · Northbound Labs
$0.70/MB1,100 MAILBOXES
TP

Set up on a Friday, sent 8,000 emails by Tuesday. No warmup wait, no ‘call us for enterprise.’ Just infrastructure that showed up and worked.

TP
Tomás ParedesGrowth · Fieldwire
4h SETUPDay 1 SEND
Trusted by 200+ outbound teams
RELAY NETWORK · LIVE
99.98% UPTIME
IN: SENDER@DOMAIN.COM
OUT: INBOX — PRIMARY
Cold Email Infrastructure

Everything you need
to scale outbound.

Built specifically for cold email. Not repurposed from consumer tools.

01 / MAILBOXES
×150

150 Mailboxes Per Domain

Google gives you 2. We give you 150. Do the math.

02 / IPs
198.51.100.23
203.0.113.58
192.0.2.144

Dedicated IPs

Your reputation is yours alone. No shared pools.

03 / DNS
SPFv=spf1 include:relay ~all✓
DKIMselector1._domainkey✓
DMARCp=none rua=...✓

Auto DNS Setup

SPF, DKIM, DMARC configured in minutes. Not hours.

04 / DELIVERABILITY
99

99% Inbox Guarantee

Or your money back. We mean it.

05 / WARMUP
D1
D2
D3
…
D14

Send From Day 1

No 2-week warmup wait. Start immediately.

06 / SETUP
02:34:08

2–4 Hour Setup

From signup to sending. Fully automated.

The Problem

You didn't sign up
to be an IT admin.

But here you are. Creating your 30th Google Workspace. Manually adding DKIM records at 2am. Keeping a spreadsheet of 100 passwords. Waiting 4 weeks for domains to warm up while your competitors are already sending.

Google / Outlook
— VS —
ColdRelay
2mailboxes
Per Domain
150mailboxes
$7.00/mo
Cost / Mailbox
$0.55/mo
4 wkswarmup
Time to First Send
Day 1
ManualDNS at 2am
Setup
Autoin minutes
Sharedwith spammers
IP Reputation
Dedicatedyours alone
Spreadsheetof passwords
Management
Onedashboard
BOTTOM LINE
12.7× cheaper · 75× more mailboxesat every comparable scale.
From Zero to Sending

Three steps. Four hours. Done.

Simple and fast. No onboarding calls, no manual configuration, no weeks of waiting. Just infrastructure that works.

STEP 01

Set Up in Minutes

Tell us your volume. We calculate mailboxes and domains. One click and your infrastructure is building. No manual DNS. No spreadsheets.

STEP 02

Scale Without Limits

Start with 50 mailboxes. Scale to 5,000+. Volume discounts kick in automatically. No new contracts. No waiting.

50mailboxes
STEP 03

Connect & Send

Plug SMTP credentials into Instantly, Smartlead, EmailBison — or any IMAP/SMTP tool. Pick one. Start sending day one.

Pricing

Calculate your exact cost.

No hidden fees. Slide to see your price at any scale.

How many emails per day do you want to send?

Each mailbox sends up to 4 emails/day. Each domain holds 100–150 mailboxes. We'll calculate the requirements for you.

Emails per day
100 emails/day
STARTER
100/day
GROWTH
1,000/day
SCALE
3,000/day
AGENCY
10,000/day
Mailboxes
25
Domains
1
Tier
1–199
$/mailbox
$1.00

Each mailbox sends 4 emails/day — 2 go to real prospects, 2 go to warmup. So 50 emails/day reach inboxes and 50 keep your reputation healthy.

Real results from real teams
“We contacted 641,000+ prospects over 12 weeks and saw a 3.3% positive reply rate. ColdRelay's infrastructure handled the volume without a single deliverability issue.”
JB
Jake BrennanCEO at ScaleOutbound · 1,000+ mailboxes
“We went from managing 47 Google Workspace accounts to a single dashboard. Cut our infra spend by 84% and our ops time almost in half.”
MR
Maya RodriguezHead of Growth at Verdant · 420 mailboxes
“Day one sending, no warmup babysitting. Booked 38 meetings in the first week — our best launch by a long shot.”
DK
Daniel KimFounder at Northwind · 150 mailboxes
“Deliverability is the whole game. We're holding 99.2% inbox placement across 2,400 mailboxes. Nothing else comes close.”
SP
Sarah PatelVP Sales at Meridian · 2,400 mailboxes
“Switched from Instantly's built-in infra to ColdRelay SMTP and reply rates jumped from 1.2% to 4.1%. Same copy, same lists — just better pipes.”
AT
Alex TanakaAgency Owner at Lift Outbound · 680 mailboxes
01 / 05
FAQ

Frequently asked questions.

How is $1/mailbox possible? +
We built purpose-specific infrastructure on Azure instead of reselling Google Workspace licenses. By cutting out consumer-tier features you'll never use, we pass the savings directly to outbound teams — down to $0.55/mailbox at scale.
What's the 99% inbox guarantee? +
If your properly-warmed mailboxes on ColdRelay infrastructure don't hit a 99% inbox placement rate on a standardized seed test, we'll refund you. It's in the contract, not the marketing.
How many mailboxes per domain? +
Up to 150 per domain, compared to 2 on Google Workspace or Microsoft 365. That means you need 75× fewer domains for the same send volume.
What tools work with ColdRelay? +
Anything that speaks IMAP/SMTP: Instantly, Smartlead, Lemlist, EmailBison, and every other mainstream outbound platform. Plug credentials in and go.
Is there a minimum order? +
No minimum. Start with 25 mailboxes for the Starter plan and scale up as you grow. Volume discounts kick in automatically.
How long does setup take? +
Typically 2–4 hours from signup to sending. DNS propagation is usually the longest step, and it's fully automated — you don't touch a thing.
Stop Overpaying

Stop paying $7/mailbox for infrastructure
that wasn't built for cold email.

Switch to purpose-built cold email infrastructure. Scale your outbound without scaling your costs.

From $0.55/mailbox → See pricing